8-bit Computer TV Channel Use

tony duell ard at p850ug1.demon.co.uk
Tue May 19 15:47:02 CDT 2015

> > My old Color Computer used US VHF channels 3 or 4 for NTSC video. I found a reference to the ZX Spectrum 
> > using UK UHF channel 35 for PAL video.
> My NTSC ZX81 uses US UHF 34/35.

Most, if not, all home computers sold to connect to TVs in the UK were set to use our UHF channel 36. They
normally used an Astec modulator unit, and a careful tweak of the oscillator coil core would move them onto
other channels. 

VHF channels were not used for broadcast 625 line TV in the UK, and most TVs could not tune to them. So you
will not find a UK home computer using VHF RF output.


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